Carl schuster



(No Model.)

G. SGHUSTER. SCHOOL DESK. No. 469,378. Patented Peb. 23, 1892.

NVENTOH ATTRNEYS` UNITED STATES PATENT OFFICE.

CARL SCHUSTER, OF BERLIN, GERMANY.

SCHOOL-DESK.

SPECIFICATION forming part of Letters Patent No. 469,378, dated February23, 1892.

` Application ned May 1891. serai No. 391,713. cto man.)

To @ZZ whom t may corr/cern:

Be it known that I, CARL .SCHUSTEIn cal)- inet-maker, a subject of theGerman Emperor, residing at 25 Dorothemstrasse, Berlin,in the Kingdom ofPrussia, German Empire, have invented a new and useful Improvement inlVriting Tables or Desks for Schools and for other Purposes, of whichthe following is a specification.

The object of my invention is to provide a writing-table which caneasily be adj usted and in such manner that it affords a convenientsupport for writing and suitable to the height of the person using it.

The invention consists of the usual frame, on top of which is arranged abox-shaped attachment with two bars passing from the front to back ofsame and two similarbars from one side to the other. To the former barsare secured bearings, in which rotates a rod or shaft carrying twoeccentrics or cams in connection with and bearing on the under side ofthe desk-table by means of elastic bands of steel, leather, or similarmaterial. To the crossbars, or those passing from side to side, areattached the ends of two metallic sliding bars, the other ends of thesebars being hinged to the under side of the desk-table. Vhen thedesk-table is pulled forward, the elastic bands attached thereto causethe eccentrics to turn, thus causing the desk-table to be raised from ahorizontal to an angular or slanting position.

If desired, wedge-shaped pieces can be secured to the under side of thedesktable,

against which the eccentrics or cams can operating mechanism. Fig. 2 isa longitudip nal section on line y, Fig. 1. Fig. 3 is a verticalcross-section through the middle of Fig. 2, looking from right to left.Fig. 3 is a similar sectional view showing a certain rack-le ver andspring and the relation of these parts to the general structure of thedesk, and Fig. 4 is an enlarged detail view.

. In said drawings, a represents a frame, on the top of which rests oris secured a boxshaped cover or attachment b. Within the frame a andextending from the front to the rear are bars c c, and above these bars4are other bars d d, extending lengthwise of the frame, as shown in Fig.l. Upon the upper surfaces of the rods c c are firmly secured bearings ce, in which revolves or rotates a shaft or rod f. To the bars d d aresecured in any desired manner guides or ways g g, in which reciprocatesliding bars h 7L. Upon the top of theframe a is arranged awriting-tableA, adapted to be moved in and out on the top of the table, as willbeliereinafter described. To this table A are hinged or pivoted on itsunder side the forward ends of the sliding bars h 7L, the other ends ofsaid bars being left free, as shown in Figs. l and 8. On the shaft orrod f are mounted or secured two eccentrics or cams 7c 7a, to the outerperiphery of which ends of straps or bands s s are attached, the otherends of said straps being secured to the under side of the table A andforward of the shaftorrodf, as shown in Fig. 3. When desired, triangularor wedge-shaped blocks j can be secured to the under side of the tableA, as shown in Fig. 3,and are so located that they can be acted ondirectly `by the eccentrics to aid in assisting the raising of the tableto such angular position as may be sought.

To facilitate the reciprocating movement of the bars h 7L and todecrease the friction, I have shown in Figs. 2 and 3 rolls r, upon whichthe bars h h rest in their movement. To prevent these bars 72, .7L frombeing drawn too far forward, a groove or recess o can be formed in therear portion of the bars, adapted and arranged to receive a lug orprojection vw on the under side of the table A, as shown in Fig. 4:.

To enable the table A to beiirmly held in any desired position after ithas been pulled or drawn forward, a recess m is formed in the upper sideof the bar CZ, and in the bottom of this recess is secured by a hinge orpivot one end of a lever n and adapted to rest within the recess whennot in use. Vithin this recess is also secured an actuating-sprin g pfor controlling the 'lever n.

On the under side ofthe table A and oppo- IOO site the recess m when thetable is pushed in is secured a rack or ratchet bar t, arranged toreceive and hold the free end of the lever n. This is shown in Fig. 3%

Having thus described my invention, what I claim as new,'and desire tosecure by Letters Patent, is-

l. An adjustable writing table or desk combining therein a frame-work aZ), a top A, adapted to slide within said frame-work, sliding bars hh,hinged to the topAand adapted to guide said top in its movement,eccentrics or cams 7c k, elastic bands s s, connecting said cams withsaid top, said eccentrics being adapted to be raised orlowered bythesliding movement of said top, and two sets of crossbarsc c and d d forsupporting' the shaft of the eccentrics and the guides for sliding barsh h, all said parts being arranged and adapted to operate substantiallyas described, and for the purpose set forth.

2. An adjustable writing table or desk combining therein a frame-Work dZ9, a top A,

adapted to slide within said frame-Work, sliding bars 7i h, hinged tosaid top, cross-bars CZ d for guiding said sliding bars, eccentrics orcams 7c 7c, elastic bands s s, connecting said cams with said top, saideccentrics being adapted to be raised or lowered by the sliding movementof top A, a rack i, secured to said top, and a lever` n, pivoted tocross-bar d and controlled by a spring p and adapted to hold the topfirmly in any desired position, all said parts being arranged andadapted to operate substantially as described, and for the purpose setforth.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

CARL SCHUSTER. Witnesses:

W. H. EDWARDS, W. HAUPT.

